New radiator but car is overheating still

No idea

No vehicle to refer to

If your adding --your best find & repair
the leak in the coolant system

You add to the system through the coolant fill cap, if you
have no radiator cap

If you follow the top radiator hose, you will see it

The big white container is a coolant tank,degas bottle,or over flow tank

That also has to have coolant & is checked when cold

That stuff is the long life coolant breaking down, flush the system and install the newer more stable coolant.

CAR OVERHEATING FIRST CHECK FOR LOW COOLANT IN THE RADIATOR COOLANT OVERFLOW JUG.IF COOLANT LEVEL IN OVERFLOW JUG LOW REFILL ADD COOLANT BACK TO THE FULL COLD MARK.PUT RADAITOR CAP ON COOLANT OVERFLOW JUG START ENGINE LET IT IDLE UNTIL IT OPERATING TEMPERATURE.MAKE SURE TOP RADIATOR HOSE GETTING HOT WHILE ENGINE WARM UP.IF TOP RADIATOR HOSE DONT GET HOT WHILE ENGINE IDLING YOUR THERMOSTAT COULD BE STUCK CLOSE CAUSING CAR TO OVERHEAT.IF TOP HOSE IS GETTING HOT.CHECK FOR COOLANT LEAKS CHECK TOP RADIATOR HOSE AND BOTTOM RADIATOR HOSE FOR LEAKS.CHECK FOR LEAKS AT THE RADIATOR CORES AND PLASTIC SIDE CONTAINERS.IF ALL IS GOOD ENGINE OVERHEATING WHILE IN A LONG TRAFFIC LINE, COOLANT FANS NOT COMING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR BLOWN COOLING FAN FUSE OR RELAY.COULD HAVE PCM FAULT.MAKE COOLING FAN ELECTRICAL CONNECTORS AND WIRING NOT DAMAGE OR BROKEN.

Sounds like a bad water pump or radiator. Make sure the radiator fins arent clogged or inside of radiator, water pump not circulating the coolant properly will also cause overheating, old coolant will not properly dissipate heat efficiently and may need flushed. Also make sure the coolant has a 50% mix of water as the water does most of the cooling not the antifreeze. Hope this gives you some good places to start.

No, you can't add too much coolant. Rather, it does not hurt anything if you do. Did you add it to the radiator, or to the overflow tank?

Let it cool, then remove the radiator cap, and if needed, add coolant to the radiator. Put the cap back on, and fill the overflow tank to the "full - cold" line. Start it and run it a few minutes and look for leaks. If you find no leaks, drive it for a day or two, then let it cool and check it again. If it is down a lot (without overheating), you have a leak somewhere. If you lose enough coolant, that will make it overheat. However, if it overheats, that can cause loss of coolant, when you stop the car, you will see steam and smell coolant, and often hear it boiling.

If it overheats again, make note of when it happens: driving on the highway, or stop-and-go around town. Overheating on the highway usually indicates a clogged radiator, while in-town overheating usually indicates a bad cooling fan (you don't need the fan above about 30 MPH). A bad fan is usually the fan relay, but it can be the fan thermostat (different from the engine thermostat), or a bad fan motor.

1990 Subaru overheating condition.

The entire cooling system needs to be checked.

1. If the coolant level is fine - and low coolant level in your cooling system is not the problem - you need to investigate further.(see 2 below)

If the coolant level is low it needs to be topped up with the correct spec coolant and then the cooling system checked for leaks which could be faulty/worn hoses and/or a leaking radiator. If the car continues to overheat after running with the correct coolant level refer to 2 below.

2. If your coolant level is fine the entire cooling system needs to be flushed out and replaced with new coolant of the correct spec. ( If this has not been done for a couple of years it should be routinely carried out in any event every 2 years regardless of any problems).

Whilst this is being carried out the thermostat needs to be removed and checked. If it has not been recently replaced, a new one of the correct spec should be fitted. It is possible that the overheating is being caused by a sticking thermostat which is impeding coolant flow between the engine and the radiator once the engine warms up.

At the same time the water pump should be removed and inspected. If the pump has never been replaced or has not been replaced for many years it is on it's last legs. A faulty/corroded water pump will be unable to flow sufficient coolant through the engines cooling system from/to the radiator and the engine will overheat.

Any old or tired looking rubber hoses (radiator and heater hoses) should be replaced while this work is being carried out.

When the servicing is completed and the new coolant added, the system will need to be bled of air. If this is not done air in the system will impede coolant flow and the engine will overheat. The entire system should then be checked for leaks.

Do not operate your vehicle whilst you have this overheating problem except to get it to the nearest reputable auto service center. You can do very expensive damage to the engine if running it overheated .

Removal of the thermostat from the cooling system is not a good idea. This upsets the coolant flow rate in the system, and that can cause the engine to overheat, even when no other problem with the cooling system exists.

Try to identify the cause of the overheating.

Ensure that engine tune, or other engine mechanical fault condition is not the cause of the overheating, then go through the checklist following:-

1) Check engine cooling fan/s are operating as required when engine temp rises above cut-in threshold - check fan control relay is ok,
2) Check for collapsing radiator hose on suction side of water-pump when motor revs raised above idle.
3) Check coolant reservoir pressure cap is serviceable,
4) Check coolant system is properly filled - carry out any bleed off procedure specified to clear any air locks- (ensure heater core coolant flow is turned on).
5) Check for combustion gas bubbles in the coolant reservoir while the motor is running - this indicates a blown head gasket. If in doubt, take it to a radiator shop and ask for a combustion gas check on your radiator.
6) Check condition of radiator core:-
i) for blockage of air flow to (bugs/grass etc),
ii) for core internal blockage to coolant flow,

If all above ok, replace the thermostat again (also ensure it is not installed upside down) - faulty new thermostats are not unheard of.

about 100K miles? sounds like a blown head gasket is allowing coolant to be pushed out the exaust,and combustion pressure is pushing fluid out the overflow.have your compression tested.

Okay! So what I did was cut my car completely off for two days, I drained the radiator by unplugging it, I took the water hose and just let the water flow in and out from the coolant housing under the hood in the right hand corner, I also let the water flow into and out of the radiator, I plugged the radiator back up after just a few clear coats of water flowed through, I filled with 1 1/2 containers of Peak 50/50 Antifreeze/Coolant. I later in the day noticed that one of my fans were out and the other one wouldn't stay on. I ran a kill switch from the inside to the fans, only one is working due to the motor on one of them but I can guarantee that my car hasn't over heated or ran hot since I did this coolant flush. And also when you put the new coolant in make sure that the car is excessively cold. If your fans aren't spinning then that's another reason. I wish you luck.